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645
FDU-C
(4)
When the outdoor unit is located at a lower height than the indoor unit in cooling operation,
the following values
should be subtracted from the values in the above table.
Height difference between the indoor unit and
5 m
10 m
15 m
outdoor unit in the vertical height differenc
Adjustment coefficient
0.01
0.02
0.03
(3)
Correction of cooling capacity in relation to one way length of refrigerant piping
It is necessary to correct the cooling capacity in relation to the one way equivalent piping length between the indoor and outdoor
units.
Note (1) Equivalent piping length can be obtained by calculating as follows.
308 series [ø15.88 (5/8”)]:
Equivalent piping length
= Real piping (0.10
×
Number of bends in piping)
408, 508 series [ø19.05 (3/4”)]:
Equivalent piping length
= Real piping (0.15
×
Number of bends in piping)
[
Equivalent piping length
< Limitation length of 5 m]
(50/60Hz)
Equivalent piping length
(1)
m
5
10
15
20
25
30
35
FDU308 type
1.0
0.99
0.98/0.975
0.97/0.965
0.96/0.95
0.95/0.94
0.94/0.925
FDU408 type
1.0
0.995/0.99
0.985/0.98
0.98/0.97
0.97/0.96
0.965/0.95
0.955/0.94
FDU508 type
1.0
0.99/0.985
0.975/0.97
0.965/0.955
0.95/0.94
0.94/0.925
0.925/0.91
Cooling
Piping length limitations
Model
All models
Item
Max. one way piping length
30 m
Max. vertical height difference
15 m
Note (1)Values in the table indicate the one way piping length between the indoor and outdoor units.
How to obtain the cooling capacity
Example
: The net cooling capacity of the model FDU308CEN-A with the air flow “High”, the piping length of 15 m, the outdoor
unit located 5 m lower than the indoor unit, indoor wet-bulb temperature at 19.0
°
C and outdoor dry-bulb temperature
35
°
C is
Net cooling capacity
= 7100
×
1.00
×
(0.98 – 0.01)
×
1.0
=
6887 W
FDU308CEN-A
Air flow “High”
Length 15 m.
Height difference 5 m
Factor by air temperatures
(2)
Correction of cooling capacity in relation to air flow rate control (fan speed)
Coefficient: 1.00 at High, 0.95 at Low
Содержание SRRM40HENG-L
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